Water pissing out of the loft tank overflow

[Crockof]

Can anyone help? I know that there is a mnetter who is a plumbing saviour?

I have had three, three heating engineers around and paid their fee. My overflow pipe is still pissing water. All have said the floaty stop cock is causing the problem, all have changed it, its still fecking pissing. I have three overflow pipes and three tanks in my loft (two massive ones and one small one)

It pisses out the moment the heating goes on (and occasionally when it isnt) it's not a drip it's a fecking waterfall. Can anyone help?

Thank you, I will have a look in the airing cupboard with a magnet tonight.

Regards replacing I'm hesitant as we have an old boiler (30+ years) that has been so reliable and so many people have said that the old boilers are better, also have been told we would need a gas pipe running around the outside of our house as the pipes are too narrow which I don't really want. However after seeing the state of the tanks I feel a bit (not envy)

One bath upstairs, one separate shower downstairs , six people in house (five always, one part time)

no need to change it then.

If and when the cylinder fails, you could have a modern unvented cylinder (no need for a cold tank in the loft) which will run off a heat-only boiler (either your old one or a modern equivalent) so no need to get a combi, so the boiler need not be of such vast power as a combi requires, so you do not necessarily need a new gas pipe. You do however need a good flow of water from the mains water supply pipe (flow is not the same as pressure).

Whatever you do, you need to get the blockage removed (if such it is). The magnet will confirm. Also have a magnetic sediment filter fitted to prevent it happening again. The filter is about £100 plus fitting and very advisable. It is a plumbing job, not a boiler job. Also add chemical protection against corrosion and limescale after fixing and cleaning (about £15 each) which you can DIY though it helps if you know how to drain the system

Do you have an expansion vessel above your main hot water tank?

We find our overflow trickles out when the pressure drops in the expansion vessel. A quick pump up of the pressure and it resolves it.

it's a blue one, so it won't